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Which of the following have negative electron affinity?

A. Kr

B. U

C. Y

D. Pb

Correct Answer :

A. Kr


Related Questions

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Which of the following is an inert gas?

A. Oxygen

B. Nitrogen

C. Argon

D. Hydrogen

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The lightest metal is

A. Li

B. Pb

C. Na

D. Al

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On moving across a period from left to right the ionisation energy increases because

A. value of principal quantum number increases

B. effective nuclear charge increases

C. atomic size increases

D. nuclear charge increases

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Which of the following has maximum ionisation energy?

A. Li

B. Ba

C. Cl

D. Be

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Lother Meyer plotted a graph of

A. Atomic volume versus atomic number

B. Atomic radii versus atomic weight

C. Atomic weight versus mass number

D. Atomic volume versus atomic weight

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In C, N, O and F the electronegativity

A. decreases from C to F

B. decreases from C to O and then increases to F

C. increases from O to C and then decreases to F

D. increases from C to F

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Elements whose atoms have incompletely filled penultimate energy levels are known as

A. s-block elements

B. p-block elements

C. d-block elements

D. inert gases

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Law of octaves was given by

A. Meyer

B. Mendeleev

C. Moseley

D. Newland

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Which of the following has minimum ionisation energy?

A. F

B. Cl

C. Br

D. I

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In the periodic table on moving from left to right across a period, the metallic character of elements

A. increases

B. decreases

C. increases and decreases

D. remains the same

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The general electronic configuration of s-block elements is

A. ns1-2

B. ns2p6

C. ns1

D. ns0 to2

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Elements belonging to the same period are

A. Si, N, O

B. Li, Be, Mg

C. Sc. Ti. V

D. Cu, Zn, Cd

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Which of the following have maximum size?

A. Cl

B. N2

C. F

D. Ne

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Which of the following conform both cation and anion?

A. I

B. Cl

C. K

D. F

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In a Lother Meyer curve sodium occurs at

A. bottom

B. peak

C. some point on the curve

D. middle of the curve

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With the increase in atomic number in a period of the periodic table

A. electron affinity decreases

B. metallic character decreases

C. ionisation energy decreases

D. atomic mass decreases

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Which of the following did not find a place in Mendeleef's periodic table?

A. Fr

B. Na

C. Ce

D. CI

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Second electron affinity of the elements is always

A. positive

B. negative

C. zero

D. more than first E.A.

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Which of the following has minimum ionisation energy

A. Ca

B. In

C. Te

D. Rb

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Which of the following has the maximum size?

A. Al-

B. Ne

C. Na+

D. F-

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An atom of an element has electronic configuration (Ar) 4s23d5, the element belongs to block

A. s

B. p

C. f

D. d

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Elements in the same vertical column has same

A. valence shell electronic configuration

B. electronic configuration

C. atomic number of isotopes

D. atomic size

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In the Mendeleef's periodic table properties of the elements are the periodic function of their

A. atomic weight

B. atomic number

C. atomic volume

D. none of these

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Modem Periodic Law was given by

A. Joule

B. Moseley

C. Klechkosky

D. Meyer

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The differentiating electron enters in the penultimate energy level in the case of

A. s block ele.

B. p block ele.

C. d block ele.

D. f block ele.

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Which of the following elements have maximum electronegativity?

A. Cl

B. Br

C. F

D. C

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The smallest ion amongst the following

A. Si+++1

B. K+

C. At1+1

D. Mg+1

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Which of the following has maximum ionisation energy ?

A. Li

B. Be

C. C

D. B

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Which of the following species have minimum size?

A. Br-

B. S-2

C. Ne

D. K+

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O2-, FF-, Na+ and Mg2+ are isoelectronic, the order of increasing size is

A. F-<Na+g++<O2-

B. F-<O2-<Na+<Mg++

C. Mg++<F-<Na+<O2-

D. Mg++<Na+<F-<O2-